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1 | /* |
2 | * Device handling code |
3 | * Linux ethernet bridge |
4 | * |
5 | * Authors: |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License |
10 | * as published by the Free Software Foundation; either version |
11 | * 2 of the License, or (at your option) any later version. |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/netdevice.h> |
16 | #include <linux/netpoll.h> |
17 | #include <linux/etherdevice.h> |
18 | #include <linux/ethtool.h> |
19 | #include <linux/list.h> |
20 | #include <linux/netfilter_bridge.h> |
21 | |
22 | #include <asm/uaccess.h> |
23 | #include "br_private.h" |
24 | |
25 | /* net device transmit always called with BH disabled */ |
26 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
27 | { |
28 | struct net_bridge *br = netdev_priv(dev); |
29 | const unsigned char *dest = skb->data; |
30 | struct net_bridge_fdb_entry *dst; |
31 | struct net_bridge_mdb_entry *mdst; |
32 | struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats); |
33 | |
34 | #ifdef CONFIG_BRIDGE_NETFILTER |
35 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { |
36 | br_nf_pre_routing_finish_bridge_slow(skb); |
37 | return NETDEV_TX_OK; |
38 | } |
39 | #endif |
40 | |
41 | u64_stats_update_begin(&brstats->syncp); |
42 | brstats->tx_packets++; |
43 | brstats->tx_bytes += skb->len; |
44 | u64_stats_update_end(&brstats->syncp); |
45 | |
46 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
47 | |
48 | skb_reset_mac_header(skb); |
49 | skb_pull(skb, ETH_HLEN); |
50 | |
51 | rcu_read_lock(); |
52 | if (is_multicast_ether_addr(dest)) { |
53 | if (unlikely(netpoll_tx_running(dev))) { |
54 | br_flood_deliver(br, skb); |
55 | goto out; |
56 | } |
57 | if (br_multicast_rcv(br, NULL, skb)) { |
58 | kfree_skb(skb); |
59 | goto out; |
60 | } |
61 | |
62 | mdst = br_mdb_get(br, skb); |
63 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
64 | br_multicast_deliver(mdst, skb); |
65 | else |
66 | br_flood_deliver(br, skb); |
67 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) |
68 | br_deliver(dst->dst, skb); |
69 | else |
70 | br_flood_deliver(br, skb); |
71 | |
72 | out: |
73 | rcu_read_unlock(); |
74 | return NETDEV_TX_OK; |
75 | } |
76 | |
77 | static int br_dev_open(struct net_device *dev) |
78 | { |
79 | struct net_bridge *br = netdev_priv(dev); |
80 | |
81 | br_features_recompute(br); |
82 | netif_start_queue(dev); |
83 | br_stp_enable_bridge(br); |
84 | br_multicast_open(br); |
85 | |
86 | return 0; |
87 | } |
88 | |
89 | static void br_dev_set_multicast_list(struct net_device *dev) |
90 | { |
91 | } |
92 | |
93 | static int br_dev_stop(struct net_device *dev) |
94 | { |
95 | struct net_bridge *br = netdev_priv(dev); |
96 | |
97 | br_stp_disable_bridge(br); |
98 | br_multicast_stop(br); |
99 | |
100 | netif_stop_queue(dev); |
101 | |
102 | return 0; |
103 | } |
104 | |
105 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
106 | struct rtnl_link_stats64 *stats) |
107 | { |
108 | struct net_bridge *br = netdev_priv(dev); |
109 | struct br_cpu_netstats tmp, sum = { 0 }; |
110 | unsigned int cpu; |
111 | |
112 | for_each_possible_cpu(cpu) { |
113 | unsigned int start; |
114 | const struct br_cpu_netstats *bstats |
115 | = per_cpu_ptr(br->stats, cpu); |
116 | do { |
117 | start = u64_stats_fetch_begin(&bstats->syncp); |
118 | memcpy(&tmp, bstats, sizeof(tmp)); |
119 | } while (u64_stats_fetch_retry(&bstats->syncp, start)); |
120 | sum.tx_bytes += tmp.tx_bytes; |
121 | sum.tx_packets += tmp.tx_packets; |
122 | sum.rx_bytes += tmp.rx_bytes; |
123 | sum.rx_packets += tmp.rx_packets; |
124 | } |
125 | |
126 | stats->tx_bytes = sum.tx_bytes; |
127 | stats->tx_packets = sum.tx_packets; |
128 | stats->rx_bytes = sum.rx_bytes; |
129 | stats->rx_packets = sum.rx_packets; |
130 | |
131 | return stats; |
132 | } |
133 | |
134 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
135 | { |
136 | struct net_bridge *br = netdev_priv(dev); |
137 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) |
138 | return -EINVAL; |
139 | |
140 | dev->mtu = new_mtu; |
141 | |
142 | #ifdef CONFIG_BRIDGE_NETFILTER |
143 | /* remember the MTU in the rtable for PMTU */ |
144 | br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu; |
145 | #endif |
146 | |
147 | return 0; |
148 | } |
149 | |
150 | /* Allow setting mac address to any valid ethernet address. */ |
151 | static int br_set_mac_address(struct net_device *dev, void *p) |
152 | { |
153 | struct net_bridge *br = netdev_priv(dev); |
154 | struct sockaddr *addr = p; |
155 | |
156 | if (!is_valid_ether_addr(addr->sa_data)) |
157 | return -EINVAL; |
158 | |
159 | spin_lock_bh(&br->lock); |
160 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
161 | br_stp_change_bridge_id(br, addr->sa_data); |
162 | br->flags |= BR_SET_MAC_ADDR; |
163 | spin_unlock_bh(&br->lock); |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
169 | { |
170 | strcpy(info->driver, "bridge"); |
171 | strcpy(info->version, BR_VERSION); |
172 | strcpy(info->fw_version, "N/A"); |
173 | strcpy(info->bus_info, "N/A"); |
174 | } |
175 | |
176 | static int br_set_sg(struct net_device *dev, u32 data) |
177 | { |
178 | struct net_bridge *br = netdev_priv(dev); |
179 | |
180 | if (data) |
181 | br->feature_mask |= NETIF_F_SG; |
182 | else |
183 | br->feature_mask &= ~NETIF_F_SG; |
184 | |
185 | br_features_recompute(br); |
186 | return 0; |
187 | } |
188 | |
189 | static int br_set_tso(struct net_device *dev, u32 data) |
190 | { |
191 | struct net_bridge *br = netdev_priv(dev); |
192 | |
193 | if (data) |
194 | br->feature_mask |= NETIF_F_TSO; |
195 | else |
196 | br->feature_mask &= ~NETIF_F_TSO; |
197 | |
198 | br_features_recompute(br); |
199 | return 0; |
200 | } |
201 | |
202 | static int br_set_tx_csum(struct net_device *dev, u32 data) |
203 | { |
204 | struct net_bridge *br = netdev_priv(dev); |
205 | |
206 | if (data) |
207 | br->feature_mask |= NETIF_F_NO_CSUM; |
208 | else |
209 | br->feature_mask &= ~NETIF_F_ALL_CSUM; |
210 | |
211 | br_features_recompute(br); |
212 | return 0; |
213 | } |
214 | |
215 | #ifdef CONFIG_NET_POLL_CONTROLLER |
216 | static void br_poll_controller(struct net_device *br_dev) |
217 | { |
218 | } |
219 | |
220 | static void br_netpoll_cleanup(struct net_device *dev) |
221 | { |
222 | struct net_bridge *br = netdev_priv(dev); |
223 | struct net_bridge_port *p, *n; |
224 | |
225 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
226 | br_netpoll_disable(p); |
227 | } |
228 | } |
229 | |
230 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
231 | { |
232 | struct net_bridge *br = netdev_priv(dev); |
233 | struct net_bridge_port *p, *n; |
234 | int err = 0; |
235 | |
236 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
237 | if (!p->dev) |
238 | continue; |
239 | |
240 | err = br_netpoll_enable(p); |
241 | if (err) |
242 | goto fail; |
243 | } |
244 | |
245 | out: |
246 | return err; |
247 | |
248 | fail: |
249 | br_netpoll_cleanup(dev); |
250 | goto out; |
251 | } |
252 | |
253 | int br_netpoll_enable(struct net_bridge_port *p) |
254 | { |
255 | struct netpoll *np; |
256 | int err = 0; |
257 | |
258 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); |
259 | err = -ENOMEM; |
260 | if (!np) |
261 | goto out; |
262 | |
263 | np->dev = p->dev; |
264 | |
265 | err = __netpoll_setup(np); |
266 | if (err) { |
267 | kfree(np); |
268 | goto out; |
269 | } |
270 | |
271 | p->np = np; |
272 | |
273 | out: |
274 | return err; |
275 | } |
276 | |
277 | void br_netpoll_disable(struct net_bridge_port *p) |
278 | { |
279 | struct netpoll *np = p->np; |
280 | |
281 | if (!np) |
282 | return; |
283 | |
284 | p->np = NULL; |
285 | |
286 | /* Wait for transmitting packets to finish before freeing. */ |
287 | synchronize_rcu_bh(); |
288 | |
289 | __netpoll_cleanup(np); |
290 | kfree(np); |
291 | } |
292 | |
293 | #endif |
294 | |
295 | static const struct ethtool_ops br_ethtool_ops = { |
296 | .get_drvinfo = br_getinfo, |
297 | .get_link = ethtool_op_get_link, |
298 | .get_tx_csum = ethtool_op_get_tx_csum, |
299 | .set_tx_csum = br_set_tx_csum, |
300 | .get_sg = ethtool_op_get_sg, |
301 | .set_sg = br_set_sg, |
302 | .get_tso = ethtool_op_get_tso, |
303 | .set_tso = br_set_tso, |
304 | .get_ufo = ethtool_op_get_ufo, |
305 | .set_ufo = ethtool_op_set_ufo, |
306 | .get_flags = ethtool_op_get_flags, |
307 | }; |
308 | |
309 | static const struct net_device_ops br_netdev_ops = { |
310 | .ndo_open = br_dev_open, |
311 | .ndo_stop = br_dev_stop, |
312 | .ndo_start_xmit = br_dev_xmit, |
313 | .ndo_get_stats64 = br_get_stats64, |
314 | .ndo_set_mac_address = br_set_mac_address, |
315 | .ndo_set_multicast_list = br_dev_set_multicast_list, |
316 | .ndo_change_mtu = br_change_mtu, |
317 | .ndo_do_ioctl = br_dev_ioctl, |
318 | #ifdef CONFIG_NET_POLL_CONTROLLER |
319 | .ndo_netpoll_setup = br_netpoll_setup, |
320 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
321 | .ndo_poll_controller = br_poll_controller, |
322 | #endif |
323 | }; |
324 | |
325 | static void br_dev_free(struct net_device *dev) |
326 | { |
327 | struct net_bridge *br = netdev_priv(dev); |
328 | |
329 | free_percpu(br->stats); |
330 | free_netdev(dev); |
331 | } |
332 | |
333 | void br_dev_setup(struct net_device *dev) |
334 | { |
335 | random_ether_addr(dev->dev_addr); |
336 | ether_setup(dev); |
337 | |
338 | dev->netdev_ops = &br_netdev_ops; |
339 | dev->destructor = br_dev_free; |
340 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
341 | dev->tx_queue_len = 0; |
342 | dev->priv_flags = IFF_EBRIDGE; |
343 | |
344 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
345 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
346 | NETIF_F_NETNS_LOCAL | NETIF_F_GSO; |
347 | } |
348 |
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